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- W4239121883 abstract "The covalent attachment of ubiquitin (Ub) to short-lived or damaged proteins is believed to be the signal that initiates their selective degradation. In several cases, it has been shown that the proteolytic signal takes the form of a multi-Ub chain in which successive Ub molecules are linked tandemly at lysine 48 (K-48). Here we show that Ub molecules can be linked together in vivo at two other lysine positions, lysine 29 (K-29) and lysine 63 (K-63). The formation of these alternative linkages is strongly dependent on the presence of the stress-related Ub conjugating enzymes UBC4 and UBC5. Furthermore, expression of Ub carrying a K-63 to arginine 63 substitution in a strain of Saccharomyces cerevisiae that is missing the poly-Ub gene, UBI4, fails to compensate for the stress defects associated with these cells. Taken together, these results suggest that the formation of multi-Ub chains involving K-63 linkages plays an important role in the yeast stress response. In broader terms, these results also suggest that Ub is a versatile signal in which different Ub chain configurations are used for different functions." @default.
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- W4239121883 date "1994-12-01" @default.
- W4239121883 modified "2023-09-23" @default.
- W4239121883 title "Stress resistance in Saccharomyces cerevisiae is strongly correlated with assembly of a novel type of multiubiquitin chain" @default.
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- W4239121883 doi "https://doi.org/10.1128/mcb.14.12.7876-7883.1994" @default.
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